Nano-Borides and Silicide Dispersed Composite Coating on AISI 304 Stainless Steel by Laser-Assisted HVOF Spray Deposition
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- Authors:
- SHARMA, Prashant
JYOTSNA DUTTA MAJUMDAR - Author Affiliations:
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, W.B. 721302, India
- Source:
- Development and Applications of Nanocomposite CoatingsJournal of thermal spray technology. 23(7):1105-1115
- Publication Date:
- 2014-01-01
- Language:
- English
- Abstract:
- The study concerned a detailed microstructural investigation of nano-borides (Cr2B and Ni3B) and nano-silicide (Ni2Si) dispersed γ-nickel composite coating on AISI 304 stainless steel by HVOF spray deposition of the NiCrBSi precursor powder and subsequent laser surface melting. A continuous wave diode laser with an applied power of 3 kW and scan speed of 20 mm/s in argon shroud was employed. The characterization of the surface in terms of microstructure, microtexture, phases, and composition were carried out and compared with the as-coated (high-velocity oxy-fuel sprayed) surface. Laser surface melting led to homogenization and refinement of microstructures with the formation of few nanosilicides of nickel along with nano-borides of nickel and chromium (Ni3B, Cr2B, and Cr2B3). A detailed microtexture analysis showed the presence of no specific texture in the as-sprayed and laser-melted surface of Cr2B and Ni3B phases. The average microhardness was improved to 750-900 VHN as compared to 250 VHN of the as-received substrate. Laser surface melting improved the microhardness further to as high as 1400 VHN due to refinement of microstructure and the presence of silicides.
- Notes:
- Metals. Metallurgy
- Subjects:
- Metallurgy, welding
Métallurgie, soudage
Sciences exactes et technologie
Exact sciences and technology
Sciences appliquees
Applied sciences
Metaux. Metallurgie
Metals. Metallurgy
Transformation de matériaux métalliques
Production techniques
Métallurgie des poudres. Matériaux composites
Powder metallurgy. Composite materials
Métaux renforcés par dispersion
Dispersion hardening metals
Traitements de surface
Surface treatment
Acier inoxydable 304
Stainless steel-304
Acier inoxydable austénitique
Austenitic stainless steel
Acero inoxidable austenítico
Austenitischer nichtrostender Stahl
Acier inoxydable
Stainless steel
Acero inoxidable
Nichtrostender Stahl
Borure
Borides
Boruro
Borid
Dépôt laser
Laser deposition
Depósito laser
Dépôt projection
Spray coating
Depósito proyección
Spritzbeschichten
Fusion laser
Laser fusion
Fusión láser
Laser
Láser
Matériau composite
Composite material
Material compuesto
Verbundwerkstoff
Microdureté
Microhardness
Microdureza
Mikrohaerte
Microstructure
Microestructura
Mikrogefuege
Métal renforcé dispersion
Dispersion strengthened metal
Metal reforzado dispersión
Dispersionsgehaertetes Metall
Projection HVOF
HVOF spraying
Proyeccion HVOF
Projection à chaud
Hot spraying
Proyección en caliente
Spritzen
Revêtement composite
Composite coating
Revestimiento compuesto
Traitement surface
Surface treatment
Tratamiento superficie
Oberflaechenbehandlung
laser melting
microhardness
microstructure
nano-boride
nano-silicide - Format:
- Academic Journal
- Database:
- PASCAL Archive
- Journal:
- Development and Applications of Nanocomposite Coatings
- Volume:
- 23
- Issue:
- 7
- Page Start:
- 1105
- Page Count:
- 11
- ISSN:
- 10599630
- Publisher:
- Heidelberg: Springer, 2014.
- Document Type:
- Article
- Physical Description:
- print, 15 ref
